package com.wujunshen.algorithm.leetcode.dynamic.programming;

/**
 * @author frank woo(吴峻申) <br>
 * email:<a href="mailto:frank_wjs@hotmail.com">frank_wjs@hotmail.com</a> <br>
 * @date 2022/8/11 16:01<br>
 */
public class 最大正方形 {
    public int maximalSquare(char[][] matrix) {
        if (matrix == null || matrix.length == 0) {
            return 0;
        }
        int m = matrix.length;
        int n = matrix[0].length;
        int[][] dp = new int[m+1][n+1];
        int result = 0;
        for (int i = 1; i <= m; i++) {
            for (int j = 1; j <= n; j++) {
                if (matrix[i-1][j-1] == '0') {
                    continue;
                }
                dp[i][j] = Math.min(dp[i-1][j-1], Math.min(dp[i-1][j], dp[i][j-1])) + 1;
                result = Math.max(result, dp[i][j]);
            }
        }
        return result*result;
    }
}
